Shelly Plus Add-on

Device identification

Device name: Shelly Plus Add-on

Short description

Shelly Plus Add-on (the Device) is a galvanically isolated sensor interface to the Shelly Plus and Gen3 devices.

Main applications

Residential
MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
Agricultural (greenhouses, hotbed, nurseries, ranches, etc. )
Government/municipal
University/college

Future integrations

Google
Amazon
Samsung SmartThings

Device electrical interfaces

Inputs

1 analog input: ANALOG IN
1 digital input: DIGITAL IN

Output

1 reference voltage output: VREF OUT
1 reference voltage through a pull-up resistor output: VREF + R1 OUT
2 ground terminals: GND*

1-Wire interface

3 sensor power supply outputs (connected to the same PCB track): VCC
3 sensor data terminals (connected to the same PCB track): DATA
3 ground terminals: GND*
Connected to the same PCB ground layer.

Add-on interface

Shelly proprietary serial interface to connect to a Shelly Plus device

Supported sensors

Up to 5 DS18B20
Single DHT22
NTC resistors with 10 kΩ nominal resistance and β=4000 K
Photoresistors
PIR sensors
Soil moisture sensors
Ultrasonic proximity sensors
Capacitive liquid level sensors
Sound detectors
Other analog sensors with 0 to 10 V output voltage

Specifications

Type	Value
Physical
Size (HxWxD):	37x42x15 ±0.5 mm / 1.46 x 1.65 x 0.59 ±0.02 in
Weigh:	105 g / 3.70 oz
Shell material:	Plastic
Screw terminals max torque:	0.1 Nm / 0.89 lbIn
Conductor cross section:	max. 1 mm² / 17 AWG
Conductor stripped length:	4.5 mm / 0.18 in
Color:	Black
Environmental
Ambient temperature:	-20 °C to 40 °C / -5 °F to 105 °F
Humidity	30 % to 70 % RH
Max. altitude	2000 m / 6562 ft
Electrical
Power supply voltage AC:	N/A
Power supply voltage DC:	3.3 V (from Shelly plus device)
Power consumption:	< 0.5 W (without sensors)
Output circuits ratings
VCC max. current:	10 mA
VREF OUT max. current:	1 mA
VREF+R1 OUT resistor	10 kΩ
Shelly Plus device firmware capabilities
Shelly Plus Addon supporting devices:	Shelly Plus devices: Shelly Plus 1 Shelly Plus 1PM Shelly Plus 1 UL Shelly Plus 1PM UL Shelly Plus 2PM Shelly Plus 2PM UL Shelly Plus i4 Shelly Plus i4DC Shelly Plus 0-10V Dimmer PM Shelly Plus RGBW PM
	Shelly Gen3 devices: Shelly 1 Gen3 Shelly 1PM Gen3 Shelly 2PM Gen3 Shelly Shutter Shelly i4 Gen3 Shelly DALI Dimmer Gen3 Shelly Dimmer 0/1-10V PM Gen3 Shelly EM Gen3
	Shelly Gen4 devices: Shelly 1 Gen4 Shelly 1PM Gen4 Shelly 2PM Gen4
Temperature reading:	Depends on the DS18B20 or DHT22 sensors
Humidity reading:	Depends on the DHT22 sensor
Digital input:	-15 V to 0.5 V (True) / 2.5 V to 15 V (False)*
Analog input range:	0 to 100%
Analog input report threshold:	1%**
Voltmeter range:	0 to 10 V
Voltmeter report threshold:	0.1 V**
Analog input / Voltmeter accuracy	Better than ±5%

* Logic can be inverted in the digital input settings
** Can be configured in the analog input / voltmeter settings

Basic wiring diagrams

Shelly Plus Add-on 1-Wire wiring diagrams

Shelly Plus Add-on analog input wiring diagrams

Legend

Terminals		External sensor pins
VCC	Sensor power supply terminals	VCC/VDD	Sensor power supply pins
DATA	1-wire data terminals	DATA/DQ	Sensor data pins
GND	Ground terminals	GND	Ground pins
ANALOG IN	Analog input
DIGITAL IN	Digital input
VREF OUT	Reference voltage output
VREF+R1 OUT	Reference voltage through a pull-up resistor* output
*For passive devices that need it to form a voltage divider.